最新刊期
      卷 0 ， 期 0 ， 2020
      • Xie Jindong Zhang Tonghe Ji Chengzhou Chen Jun
        Issue 9, (1993)
        摘要：The oxidation resistance property of Y+ implanted H13 steel has been studied by ion backscattering. The Y concentration profiles were measured for Y+ implantation with various doses and current densities. The results show that the Y concentration profiles and peak concentrations are closely related with dose and current density. The oxidation resistance property is powerfully influenced by Y peak concentration. The oxidation model of H13 steel is modified due to the Y+ implantation. The oxygen diffusion is controlled. The oxidation barrier is formed after high temperature oxidation （800℃） for 10min and the oxidation speed is decreased by a factor of 8.  
          
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        发布时间：2021-04-09
      • Yuan Junqian Wang Yongchang Yang Jingkang Qiu Jiuzi
        Issue 9, (1993)
        摘要：The cross sections of 204Pb（n,2n）203Pb and 206Pb（n, α）203Hg reactions have been measured by using the activation method in the neutron energy range of 13.50-14.81 MeV. Neutron fluence dose was calibrated with the cross sections of 27Al（n,α）24Na reaction and neutron energies were determined by using the cross section ratios of 90Zr（n,2n） 89m+gZr to 93Nb（n,2n）92mNb reactions. The results obtained are compared with the published data.  
          
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        发布时间：2021-04-09
      • Yin Duanzhi Li Yan Huang Wenda Shi Shuanghui
        Issue 9, (1993)
        摘要：A separation procedure of trace platinum from large amount of mercury and other interference elements is described and it has been successfully applied to the identification of new isotope 202Pt. After irradiation the HgO target was dissolved in concentrated HC1 solution. The thallium fraction was removed by the solvent extraction with ether. In the aqueous phase after extraction the radioisotope of platinum produced by irradiation was precipitated as （NH4）2PtCl6 by adding saturated solution of NH4Cl in the presence of H2PtCl6·6H2O as stable carrier. The decontamination factors from mercury, gold and thallium and the recovery of platinum in the process of separation are satisfactory.  
          
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        发布时间：2021-04-09
      • Mao Yu Zhu Weihua Wang Zhishan Chen Hanmin Xu Jianbo
        Issue 9, (1993)
        摘要：In the paper a method to install and adjust the scanning proton microprobe at SINR was described. The resolution of the SPM was improved and reached 2-3μm for 3MeV H+ and 2MeV He+ beams at a current intensity of 100pA by the aberration control.  
          
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        发布时间：2021-04-09
      • Gao Haibin Wu Weimin Wu Songmao Lu Fuquan
        Issue 9, (1993)
        摘要：A low energy ion detector consisting of an A12O3 conversion dynode, an electrical optical system and a channeltron has been designed and tested. Ion beams bombard the converter plate at an angle of 70° , and secondary electrons are focused and then detected by the channeltron. For 10keV Ar ions, the variation of efficiency with counting rate has been studied and efficiency is 100% for counting rate of up to 104 cps.  
          
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        发布时间：2021-04-09
      • Zhang Nianbao Peng Qingyi Zhong Desong
        Issue 9, (1993)
        摘要：This paper reports the preparation of deuterium and tritium labelled ST-1435 （19-Nor-16-methylene-17 α-acetoxy-progesterone （Ⅱ）） by decarboxylation of 16-methylene-17α-acetoxy-19-oci acid-pregnen- 4-ene-3, 20-dione （Ⅰ） in deuterated or tritiated solvents. Deuterium incorportion rate for m/e 371（M+） was 22.6% as determined by mass spectrometer. The tritiated ST-1435 was obtained with a specific radioactivity of 52.5 TBq/mol and a radiochemical purity of over 95%.  
          
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        发布时间：2021-04-09
      • Zhang Weiping Shen Jianfeng Lu Zhaolun
        Issue 9, (1993)
        摘要：The contents of 138La and 176Lu in some rare earth mines have been measured with a HPGe γ spectrometer. The measurements show that the contents of 138La and 176Lu in one rare earth mine are remarkably different from those in the other and they do not display a proportional relation, and that the contents of 40K in this mine are very low.  
          
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        发布时间：2021-04-09
      • Zhou Yongxing
        Issue 9, (1993)
        摘要：To ensure personal safety, much improvement has been made in the design of 60Co irradiation compartment. The shielding door was interlocked while the 60Co source to being lifted to the irradiation position or lowered to the shielded position. A universal change-over switch was used to cut the power supply when the source moved beyond the limits. Both γ-ray alarm and a closed-TV system were adopted. The electromagnetic attraction method was employed to shift the 60Co source from the Pb container to the source pipe.  
          
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        发布时间：2021-04-09
      • Li Guisheng Wang Jing Zhao Yansen Li Wenjian Zhang Tianmei Li Zongqiang
        Issue 9, (1993)
        摘要：The fluence rates for thermal neutrons and fast neutrons （En>6MeV, 11MeV, 20MeV and 50MeV respectively） in the 50MeV/u 12C-ion target area were experimentally measured with the neutron activation method of threshold detectors.  
          
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        发布时间：2021-04-09
      • Ren Diyuan Lu Wu Yu Xuefeng Fan Long Gao Wenyu Yan Rongliang
        Issue 9, (1993)
        摘要：A measurement, analysis and data processing system has been developed to study the total dose effects on linear integrated circuits. By means of this system, the ionizing radiation effects and the annealing characteristics of various operational amplifiers have been investigated. Damage and failure mechanism were analysed, and a method was presented to evaluate ionizing radiation damage to different types of operatioal amplifiers used in radiation environment typically.  
          
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        发布时间：2021-04-09
      • CHEN Jingzhong
        Issue 9, (1993)
        摘要：This paper presents the calculation for dose in radiation field of industrial X- rays radiography and the evaluation for thickness of barrier shielding against X- rays. It provides a technical method and instruction for administrative, protective and designing units.  
          
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        发布时间：2021-04-09
      • Gong Linghua Shen Yixiong Yang Xiangjun Li Renxing Jin Ruixin
        Issue 9, (1993)
        摘要：The control and monitor system of the EN-tandem accelerator at Peking University consists of three parts: the control and monitor of the negative ion source using micro-motor, optical fiber and micro-computer; the charging and high voltage stabilization system; and the automatic vacuum control system adopting two programmable controllers.  
          
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        发布时间：2021-04-09
      • Xu Tianbing Zhou Junsi Qiu Changqing Zhu Peiran
        Issue 9, (1993)
        摘要：The preparation of various kinds of targets for Middleton Ⅶ type ion source is described. More than 30 negative ion species with fairly high beam intensity can be obtained on the 2×1.7MV tandem accelerator. The effects of material, shape and size of targets on beam qualities have been studied. The operating parameters, such as cesium vapor pressure, ionizer current, target voltage and the position of target were also optimized to prolong target’s lifetime and improve beam’s qualities.  
          
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        发布时间：2021-04-09
      • Qiao Shengzhong Zhu Rongbao
        Issue 9, (1993)
        摘要：Non-destructive assay of nuclear materials is widely employed throughout the nuclear fuel cycle. The applications at different kinds of nuclear facilities are summarized in this paper. Also described are the basic principles and features of the methods, which include active and passive gamma ray spectrometry, X-ray fluorescence, passive neutron counting and neutron interrogation and so on.  
          
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        发布时间：2021-04-09
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